Home » ANSI/IES LS-1-21, Lighting Science: Nomenclature and Definitions for Illuminating Engineering » angle of collimation
The angle subtended by a luminaire at an irradiated surface.
This term is obsolete.
NOTE: This definition was changed in ANSI/IES RP-16-17 Addendum 4.
Illuminating Engineering Society120 Wall Street, 17th FloorNew York, NY 10005-4001+1 212-248-5000